Tie-back system for cranes, in particular heavy load...

Details Tie-back system for cranes, in particular heavy load... Tie-back system for cranes, in particular heavy load...

2006-09-06

2009-12-01

Brahan, Thomas J (Department: 3654)

Traversing hoists

Adjustable to transport or nonuse position

Collapsible inverted 'v' frame supports boom rigging

C212S175000, C212S309000

Reexamination Certificate

active

07624882

ABSTRACT:
The invention relates to a tie-back system for a crane comprising a rotatable base with a generally vertical support frame and a lifting arm which is with a lower end hingedly connected to the base in a hinge point, an upper part of the frame carrying a displacement member movable relative to the frame, the displacement member carrying a first cable guide means, a first cable extending from a first connection point on the arm along the first cable guide means to a first pulling device.The displacement member comprising a tie connection point for connection to a tie member, a second cable guide means attached to an upper part of the frame and a second cable extending from a second connection point on the arm along the second cable guide means to a second pulling device.The frame comprising a stop part situated near the displacement member, wherein in a load transfer position the displacement member engages with the stop part for transferring a load on the first cable guide means to the frame, the displacement member in a tie-back position being disengaged from the stop part for transferring a load on the first cable guide means to a tie member which in the tie-back position is one side attached to a connection point at a distance from hinge point of the lifting arm, and on the other side to the tie connection point of the displacement member.

REFERENCES:
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patent: 12 46 969 (1967-08-01), None
patent: 07 187576 (1965-07-01), None
patent: 54-104156 (1979-08-01), None
International Search Report of the corresponding PCT International Application No. PCT/NL2006/050224, dated May 23, 2007.
English Abstract of JP Publication No. 07 187576 A.

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